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FreeFileSync: Free Folder Comparison and Synchronization Tool

"In this age of multiple types of data storage devices and
increasing importance of the data keeping the updated data can be
confusing at times and the chances of accidently overwriting or
deleting important information has become higher. You may be having
the same data stored in different computers,your USB drive, network
devices, in your mobile or online storage.

"Some changes are frequently made in this data stored in
specific storage device and it is vital to match this data with the
other storage devices else you will end up losing the updated data
and would keep on using the old data wasting lots of your time and
efforts."